Solitary wave structures observed by the Ulysses spacecraft in the solar wind were analyzed using both inverse scattering theory as well as direct numerical integration of the derivative nonlinear Schrodinger (DNLS) equation. Several of these structures were found to be consistent with soliton solutions of the DNLS equation. Such solitary structures have been commonly observed in the space plasma environment and may, in fact, be longlived solitons. While the generation of these solitons may be due to an instability mechanism, e.g., the mirror instability, they may be observable far from the source region due to their coherent nature.
Wheeler, Harry R.; Reynolds, M A.; and Hamilton, Robert L., "Interpreting Ulysses Data Using Inverse Scattering Theory: Oblique Alfven Waves" (2015). Faculty Publications - Department of Mathematics and Applied Science. 6.